High School

The vapor pressure of water is 12.3 kPa at 300 K. Calculate the vapor pressure of a 1 molar solution.

A) 12.3 kPa
B) 24.6 kPa
C) 36.9 kPa
D) 49.2 kPa

Answer :

Final answer:

The question intends to find the vapor pressure of a 1 molar solution using the knowledge of the vapor pressure of pure water and Raoult's Law, but lacks essential information about the total number of moles which is necessary for the calculation.

Explanation:

The question involves calculating the vapor pressure of a 1 molar solution given the vapor pressure of pure water at a certain temperature.

The solution's vapor pressure can be found using Raoult's Law which states that the partial vapor pressure of a solvent above a solution is equal to the vapor pressure of the pure solvent at that temperature multiplied by the mole fraction of the solvent in the solution. Since we are dealing with a 1 molar solution, the solute will have some effect on the vapor pressure of the solvent.

However, there seems to be a critical piece of information missing in the problem provided, that is necessary to perform the calculation as per Raoult's Law:

the total number of moles of both solute and solvent. Without this information, we cannot calculate the vapor pressure directly. Therefore, based on the given options and without further context, the vapor pressure of the solution cannot be accurately determined.